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Uncertainty estimation of the mean specific heat capacity for the major gases contained in biogas

Author

Listed:
  • P. Trávníček

    (Department of Agricultural, Food and Environmental Engineering, Faculty of Agronomy, Mendel University in Brno, Brno, Czech Republic)

  • I. Vitázek

    (Department of Transport and Handling, Slovak University of Agriculture in Nitra, Nitra, Slovakia)

Abstract

The paper is focused on the uncertainty estimation of the mean isobaric and isochoric specific heat capacity calculation. The differences in the data among the individual sources for the technical calculation are presented in the first part of the paper. These differences are discussed in this paper. Research of scientific work with listed values of measurement uncertainties has been carried out in the second part of the paper. Furthermore, mathematical models were calculated which describe the dependence of the specific heat capacities and temperature. The maximal error models were carried out. Two approaches were used for the calculation of the mean specific heat capacity. The first approach is the calculation with help of integration of the function which describes the dependence of the specific heat capacity and temperature. The second approach is the calculation of a simple arithmetic mean of the specific heat capacity related to the maximal and minimal value of the temperature interval. The conclusion of the work shows that the time-effective second way is applicable in the case of a narrow temperature range. A value of 5.5% (Δt = 200 K) was reached for the relative uncertainty. This is a similar value to that in the case of using the first way.

Suggested Citation

  • P. Trávníček & I. Vitázek, 2020. "Uncertainty estimation of the mean specific heat capacity for the major gases contained in biogas," Research in Agricultural Engineering, Czech Academy of Agricultural Sciences, vol. 66(2), pages 52-59.
    • Handle: RePEc:caa:jnlrae:v:66:y:2020:i:2:id:4-2020-rae
    DOI: 10.17221/4/2020-RAE
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    References listed on IDEAS

    as
    1. I. Vitázek & J. Klúčik & J. Jablonický & P. Vereš, 2016. "Ideal cycle of combustion engine with natural gas as a fuel," Research in Agricultural Engineering, Czech Academy of Agricultural Sciences, vol. 62(SpecialIs), pages 14-20.
    2. R. Adamovský & D. Adamovský & D. Herák, 2004. "Exergy of heat flows of the air-to-air plate heat exchanger," Research in Agricultural Engineering, Czech Academy of Agricultural Sciences, vol. 50(4), pages 130-135.
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